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Loans Receivable - Schedule of Loans Receivable (Details) - USD ($) | Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 14,786,826,000 | $ 14,467,722,000 |  |
Ratio of loan type to all loans | 100.00% | 100.00% |  |
Allowance for credit losses on loans | $ 170,189,000 | $ 166,955,000 | $ 147,513,000 | $ 149,284,000
Loans in process | 1,679,972,000 | 1,456,072,000 |  |
Net deferred fees, costs and discounts | 55,655,000 | 52,378,000 |  |
Total loan contra accounts | 1,905,816,000 | 1,675,405,000 |  |
Net loans | 12,881,010,000 | 12,792,317,000 |  |
Commercial loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 8,702,524,000 | $ 8,163,029,000 |  |
Ratio of loan type to all loans | 58.90% | 56.30% |  |
Allowance for credit losses on loans | $ 119,207,000 | $ 109,923,000 | 89,581,000 | 89,335,000
Commercial loans | Multi-family |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 1,610,796,000 | $ 1,538,762,000 |  |
Ratio of loan type to all loans | 10.90% | 10.60% |  |
Allowance for credit losses on loans | $ 14,363,000 | $ 13,853,000 | 10,506,000 | 10,404,000
Commercial loans | Commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 1,954,154,000 | $ 1,895,086,000 |  |
Ratio of loan type to all loans | 13.20% | 13.10% |  |
Allowance for credit losses on loans | $ 23,496,000 | $ 22,516,000 | 13,067,000 | 13,024,000
Commercial loans | Commercial and Industrial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 2,256,627,000 | $ 2,132,160,000 |  |
Ratio of loan type to all loans | 15.30% | 14.70% |  |
Allowance for credit losses on loans | $ 44,317,000 | $ 38,665,000 | 33,676,000 | 32,235,000
Commercial loans | Commercial and Industrial [Member] | SBA Payroll Protection Program, CARES Act |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 646,887,000 | 762,004,000 |  |
Allowance for credit losses on loans | 0 | 0 |  |
Commercial loans | Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 2,687,708,000 | $ 2,403,276,000 |  |
Ratio of loan type to all loans | 18.20% | 16.60% |  |
Allowance for credit losses on loans | $ 26,365,000 | $ 24,156,000 | 21,919,000 | 22,768,000
Commercial loans | Land - acquisition & development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 193,239,000 | $ 193,745,000 |  |
Ratio of loan type to all loans | 1.30% | 1.30% |  |
Allowance for credit losses on loans | $ 10,666,000 | $ 10,733,000 | 10,413,000 | 10,904,000
Consumer loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 6,084,302,000 | $ 6,304,693,000 |  |
Ratio of loan type to all loans | 41.10% | 43.70% |  |
Allowance for credit losses on loans | $ 50,982,000 | $ 57,032,000 | 57,932,000 | 59,949,000
Consumer loans | Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 659,364,000 | $ 674,879,000 |  |
Ratio of loan type to all loans | 4.50% | 4.70% |  |
Allowance for credit losses on loans | $ 3,594,000 | $ 3,555,000 | 2,930,000 | 2,880,000
Consumer loans | Single-family residential |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 5,063,053,000 | $ 5,304,689,000 |  |
Ratio of loan type to all loans | 34.20% | 36.70% |  |
Allowance for credit losses on loans | $ 38,613,000 | $ 45,186,000 | 46,356,000 | 47,771,000
Consumer loans | Land - consumer lot loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 110,841,000 | $ 102,263,000 |  |
Ratio of loan type to all loans | 0.70% | 0.70% |  |
Allowance for credit losses on loans | $ 2,958,000 | $ 2,729,000 | 2,567,000 | 2,635,000
Consumer loans | HELOC |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 139,752,000 | $ 139,703,000 |  |
Ratio of loan type to all loans | 0.90% | 1.00% |  |
Allowance for credit losses on loans | $ 2,362,000 | $ 2,571,000 | 2,034,000 | 2,048,000
Consumer loans | Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 111,292,000 | $ 83,159,000 |  |
Ratio of loan type to all loans | 0.80% | 0.60% |  |
Allowance for credit losses on loans | $ 3,455,000 | $ 2,991,000 | $ 4,045,000 | $ 4,615,000

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